the environment where these pythons now live is not used to them. these creatures have evolved from places like the rainforest in southeast asia or the african savannah, and the habitat or the grassland habitat that you find in the everglades just simply is not equipped to deal with these very new and very invasive species. basically these pythons are invaders, and they are eating everything they come in contact with. >> you say these very new, are these pythons that were people's pets? >> likely that's how all of this originated. pot past 30 years people have been importing these snakes. a lot less lately. but during the 1970s and 1980s thousands and thousands of these snakes were brought in from asia and africa, and more often than not they either escaped because of hurricanes or people released them into environments where they shouldn't have, and these animals took over. they started out as pets, and then through negligence were released and, unfortunately, this ecosystem just really is not prepared to take on what these snakes do to the environ